The test center of this question is the scope of compulsory bidding and the items that cannot be tendered. Individual investment projects are large-scale infrastructure, public utilities and other projects related to public interests and public safety, and the estimated contract price is up to standard, bidding must also be invited; So, B is wrong. The project whose main construction technology adopts a specific patent can be exempted from bidding, so C is wrong. See textbook P42.